256517270251357 has 2 divisors, whose sum is σ = 256517270251358. Its totient is φ = 256517270251356.

The previous prime is 256517270251279. The next prime is 256517270251387. The reversal of 256517270251357 is 753152072715652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203066461519321 + 53450808732036 = 14250139^2 + 7311006^2 .

It is a cyclic number.

It is not a de Polignac number, because 256517270251357 - 2²⁷ = 256517136033629 is a prime.

It is a super-2 number, since 2×256517270251357² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256517270251387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128258635125678 + 128258635125679.

It is an arithmetic number, because the mean of its divisors is an integer number (128258635125679).

Almost surely, 2^{256517270251357} is an apocalyptic number.

It is an amenable number.

256517270251357 is a deficient number, since it is larger than the sum of its proper divisors (1).

256517270251357 is an equidigital number, since it uses as much as digits as its factorization.

256517270251357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30870000, while the sum is 58.

The spelling of 256517270251357 in words is "two hundred fifty-six trillion, five hundred seventeen billion, two hundred seventy million, two hundred fifty-one thousand, three hundred fifty-seven".